Residential transformer sizing
Residential transformer sizing
(OP)
What is the best calculation to use to size a residential overhead transformer if I know the maximum peak KWH use in a one year period?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Residential transformer sizing
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RE: Residential transformer sizing
A single house is seldom fed by a dedicated transformer. Usually it feeds multiple houses. Where does this transformer get its supply from?
Rafiq Bulsara
http://www.srengineersct.com
RE: Residential transformer sizing
RE: Residential transformer sizing
RE: Residential transformer sizing
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Residential transformer sizing
We have a group of six houses fed off of one transformer.
We are going to split the load and put 3 houses on one transformer and three on another.
We are going to assume the power factor is one so that KVA = KW.
The maximum readings I retrieved from out automatic meter reading database are the max KWH over a one hour period during the past year.
I know there are other ways to calculate this problem.
I was interested in how others might approach the problem.
RE: Residential transformer sizing
This could be used for sizing the transformer if you only had one customer on the transformer and your assumption of unity pf was good. Unfortunately, with three customers on the transformer, the maximum one hour average kW is not the sum of the three maximum readings because they don't necessarily occur at the same time. The sum of the three customers' max one hour kW would be a much better value to use than the average kW over one year.
The sum of the max hourly kW for the customers will probably be close enough for transformer sizing. It will be a conservative estimate of the peak transformer kW, but since the pf will be less than one, this will make it less conservative as a measure of peak kVA.
RE: Residential transformer sizing
This may not be that big a deal for 3 houses, but for larger collections of customers, these factors become important.